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Copyright 2014 by Janine Micheli-Jazdzewski ii Dedication I would like to dedicate this thesis to Rock, who is not with us anymore, TR, General Jack D. Ripper, and Page. Thank you for sitting with me while I worked for countless hours over the years. iii Acknowledgements I would like to express my special appreciation and thanks to my advisor Dr. Deanna Kroetz, you have been a superb mentor for me. I would like to thank you for encouraging my research and for helping me to grow as a research scientist. Your advice on both research, as well as on my career have been priceless. I would also like to thank my committee members, Dr. Laura Bull, Dr. Steve Hamilton and Dr. John Witte for guiding my research and expanding my knowledge on statistics, genetics and clinical phenotypes. I also want to thank past and present members of my laboratory for their support and help over the years, especially Dr. Mike Baldwin, Dr. Sveta Markova, Dr. Ying Mei Liu and Dr. Leslie Chinn. Thanks are also due to my many collaborators that made this research possible including: Dr. Eric Jorgenson, Dr. David Bangsberg, Dr. Taisei Mushiroda, Dr. Michiaki Kubo, Dr. Yusuke Nakamura, Dr. Jeffrey Martin, Joel Mefford, Dr. Sarah Shutgarts, Dr. Sulggi Lee and Dr. Sook Wah Yee. A special thank you to the RIKEN Center for Genomic Medicine that generously performed the genome-wide genotyping for these projects. Thanks to Dr. Steve Chamow, Dr. Bill Werner, Dr. Montse Carrasco, and Dr. Teresa Chen who started me on the path to becoming a scientist. Special thanks to my parents, Dr. Robert Micheli (the real Dr. Micheli) and Edie Micheli and my sister Jill Micheli who have supported and encouraged me to continue my education. Thank you to my husband John Jazdzewski who has put up with me on a day to day basis. I would also like to thank all of my friends (Dana!) who supported me in writing, and encouraged me to strive towards my goal. iv Abstract Since the emergence of the HIV epidemic it has been recognized that complications to HIV infection and variations in drug response and toxicity are influenced by patient genetics. Identification of genetic predictors of HIV infection complications and variation in drug response and toxicity will lead to better treatment options for patients and reduce HIV-related mortality and morbidity. This dissertation contains research that uses candidate gene and genome-wide approaches to identify and characterize novel genetic predictors of nevirapine pharmacokinetics, nucleoside reverse transcriptase inhibitor-induced peripheral neuropathy and HIV-induced peripheral neuropathy. This research demonstrates that nevirapine pharmacokinetic properties are heritable in European and African patients and characterizes the significant effects of CYP2B6 516G>T, CYP2B6 983T>C and ABCC10 rs2125739 on nevirapine Cmin concentrations in a Ugandan HIV+ population. It also highlights the importance of considering all three polymorphisms for prediction of nevirapine Cmin. This dissertation also explores the genetic predictors of NRTI-SN using whole genome and candidate gene approaches in a Ugandan HIV+ population. A polymorphism in VAMP4, rs188298690, was identified in the whole genome study and bioinformatic analyses found that this marker is in an active regulatory region and also a population specific eQTL locus. The candidate gene analysis found that polymorphisms in SLC28A1 and ABCC4 are predictive of the development of NRTI-SN. Finally, this dissertation describes research to identify genetic predictors of HIV-SN. Several polymorphisms in the FOLH1 region were identified in a whole genome study and bioinformatic analyses support a role for these polymorphisms in determining FOLH1 expression. Analysis of the top FOLH1 v polymorphism in additional samples showed a trend towards significance and a meta- analysis of the discovery and replication cohorts had improved statistical significance. The research obtained in this dissertation increases the understanding of the role of genetic variation in determining antiviral pharmacokinetics and toxicity and in complications to HIV infection. vi TABLE OF CONTENTS TITLE PAGE ............................................................................................................... i DEDICATION ............................................................................................................. iii ACKNOWLEGEMENTS ............................................................................................. iv ABSTRACT ................................................................................................................ v TABLE OF CONTENTS ............................................................................................ vii LIST OF TABLES ....................................................................................................... xi LIST OF FIGURES .................................................................................................. xiii Chapter 1: Introduction 1.1. HISTORY OF HIV/AIDS ...................................................................................... 1 1.2. OVERVIEW OF HIV ............................................................................................ 6 1.3. AZT DISCOVERY AND APPROVAL ................................................................ 11 1.4. ANTIRETROVIRAL (ARV) PHARMACOLOGY ................................................. 14 1.4.1. ARV Overview ......................................................................................... 14 1.4.2. NRTI Pharmacology ................................................................................ 18 1.4.3. NNRTI Pharmacology .............................................................................. 19 1.4.4. PI Pharmacology ..................................................................................... 21 1.4.5. Integrase Inhibitor and Entry Inhibitor Pharmacology .............................. 22 1.5. PHARMACOGENETICS OF ARV THERAPY ................................................... 23 1.6. DISSERTATION AIMS ...................................................................................... 28 1.7. REFERENCES ................................................................................................. 30 Chapter 2: Measuring the Overall Genetic Component of Nevirapine Pharmacokinetics and the Role of Selected Polymorphisms: Towards Addressing the Missing Heritability in Pharmacogenetic Phenotypes? 2.1. ABSTRACT ....................................................................................................... 41 vii 2.2. INTRODUCTION .............................................................................................. 43 2.3. MATERIALS AND METHODS .......................................................................... 45 2.3.1. Study Design and Subjects ..................................................................... 45 2.3.2. Nevirapine Quantification ........................................................................ 45 2.3.3. Genotyping .............................................................................................. 46 2.3.4. Calculation of Pharmacokinetic Parameters ............................................ 47 2.3.5. Calculation of Relative Genetic Component ............................................ 47 2.3.6. Statistical Methods .................................................................................. 48 2.4. RESULTS ......................................................................................................... 48 2.4.1. Ethnicity does not play a role in nevirapine AUC0-6h variability ................ 48 2.4.2. Age and sex do not play a role in the variability of nevirapine AUC0-6h .... 51 2.4.3. There is a genetic contribution to variation in nevirapine AUC0-6h............ 51 2.4.4. CYP2B6 516G>T may influence nevirapine AUC0-6h ............................... 51 2.5. DISCUSSION .................................................................................................... 56 2.6. CONCLUSIONS ................................................................................................ 57 2.7. REFERENCES ................................................................................................. 59 Chapter 3: CYP2B6 and ABCC10 Polymorphisms Influence Nevirapine Exposure in HIV+ Ugandans 3.1. ABSTRACT ....................................................................................................... 62 3.2. INTRODUCTION .............................................................................................. 64 3.3. MATERIALS AND METHODS .......................................................................... 65 3.3.1 Study Design and Patients ....................................................................... 65 3.3.2. Nevirapine Quantification ........................................................................ 66 3.3.3. Genotyping .............................................................................................. 67 3.3.4. Statistical Methods .................................................................................. 69 3.4. RESULTS ......................................................................................................... 71 viii 3.4.1. Characteristics of Study Participants and Analysis of the Effect of Demographic Characteristics on NVP Cmin ............................................. 71 3.4.2. Several polymorphisms are associated with NVP Cmin ............................ 72 3.4.3. Polymorphisms
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